From: ruvim.pinka@gmail.com   
      
   On 2025-05-08 06:52, dxf wrote:   
   > On 8/05/2025 3:52 am, Ruvim wrote:   
   >> ...   
   >> I use `quit` only for testing and debugging. And I expect to get into the   
   Forth text interpreter (Forth shell) exactly in the current program state (as   
   far as possible).   
   >>   
   >> If `quit` simply calls `-56 throw`, the program state will probably change   
   (due to actions after `catch` in the program, including restoring the data   
   stack depth in `throw`) when you get into the Forth shell. Also, there is a   
   chance that you will not    
   get into the Forth shell at all if the program does not re-throw the error in   
   some places.   
   >>   
   >> So I would not recommend the suggested deviation in the `quit` behavior   
   even for new implementers, since this brakes the well-known expectation from   
   `quit`. A better way is to introduce another word with desired behavior   
   deviation.   
   >   
   > ANS never gave a rationale for ABORT ABORT" QUIT - only options that we're   
   now   
   > exploring.   
   >   
   > For the reasons you've stated I'm reluctant to define:   
   >   
   > : QUIT -56 THROW ;   
   >   
   > But are there reasons an application might were THROW able to handle it?   
      
   I don't see such a reason. The application can simply do `abort` or `-56   
   throw` (and no special cases are needed).   
      
   If you need the Forth shell in the application data stack and state — do   
   `quit`. If you need to break the application execution — do `abort`.   
      
      
   Probably, the external signal SIGTERM can be transferred to `-56 throw`   
   in the Forth system, and the external signal SIGINT (Ctrl+C) can be   
   transferred to `-28 throw`.   
      
      
      
   > It's arguable ANS left the door open. Just because the spec for THROW didn't   
   > special-case -56 doesn't mean an implementer can't.   
      
   The implementer can special-case -56 (as well as anything else) only to   
   the extent that it does not affect a standard program.   
      
      
   --   
   Ruvim   
      
   --- SoupGate-DOS v1.05   
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